public Gost_28147_89_ImitHashAlgorithm(Gost_28147_89_SymmetricAlgorithmBase key) : base(key.ProviderType, DefaultHashSize)
{
if (key == null)
{
throw ExceptionUtility.ArgumentNull(nameof(key));
}
KeyValue = null;
_keyAlgorithm = Gost_28147_89_SymmetricAlgorithm.CreateFromKey(key);
}
public static Gost_28147_89_SymmetricAlgorithm CreateFromKey(Gost_28147_89_SymmetricAlgorithmBase keyAlgorithm)
{
if (keyAlgorithm == null)
{
throw ExceptionUtility.ArgumentNull(nameof(keyAlgorithm));
}
return((keyAlgorithm is Gost_28147_89_SymmetricAlgorithm sessionKey)
? new Gost_28147_89_SymmetricAlgorithm(keyAlgorithm.ProviderType, sessionKey._providerHandle, sessionKey.GetSafeHandle())
: new Gost_28147_89_SymmetricAlgorithm(keyAlgorithm.ProviderType)
{
Key = keyAlgorithm.Key
});
}
public override byte[] EncodePrivateKey(Gost_28147_89_SymmetricAlgorithmBase keyExchangeAlgorithm, GostKeyExchangeExportMethod keyExchangeExportMethod)
{
if (keyExchangeAlgorithm == null)
{
throw ExceptionUtility.ArgumentNull(nameof(keyExchangeAlgorithm));
}
int keyExchangeExportAlgId;
if (keyExchangeExportMethod == GostKeyExchangeExportMethod.GostKeyExport)
{
keyExchangeExportAlgId = Constants.CALG_SIMPLE_EXPORT;
}
else if (keyExchangeExportMethod == GostKeyExchangeExportMethod.CryptoProKeyExport)
{
keyExchangeExportAlgId = Constants.CALG_PRO_EXPORT;
}
else
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(keyExchangeExportMethod));
}
var currentSessionKey = keyExchangeAlgorithm as Gost_28147_89_SymmetricAlgorithm;
if (currentSessionKey == null)
{
using (var derivedSessionKey = new Gost_28147_89_SymmetricAlgorithm(ProviderType))
{
derivedSessionKey.Key = keyExchangeAlgorithm.Key;
return(EncodePrivateKeyInternal(derivedSessionKey, keyExchangeExportAlgId));
}
}
return(EncodePrivateKeyInternal(currentSessionKey, keyExchangeExportAlgId));
}
/// <summary> /// Экспортирует (шифрует) секретный ключ. /// </summary> /// <param name="keyExchangeAlgorithm">Общий секретный ключ.</param> /// <param name="keyExchangeExportMethod">Алгоритм экспорта общего секретного ключа.</param> public abstract byte[] EncodePrivateKey(Gost_28147_89_SymmetricAlgorithmBase keyExchangeAlgorithm, GostKeyExchangeExportMethod keyExchangeExportMethod);
